Straining device for vacuum drying apparatus



Jan. 1, 1935. A, JQNSSON 1,986,108

STRAINING DEVICE FOR VACUUM DRYING APPARATUS Filed June 30, 1953 2Sheets-Sheet 1 Jan. 1, 1935. E, JQNSSQN 1,986,108

STRAINING DEVICE FOR VACUUM DRYING APPARATUS Filed June 30, 1933 2Sheets-Sheet 2 i 1v VEN 76 fiueua Tl/VUS [a v/mo .76/vsson HTTORNEYPatented Jan. 1, 1935 i w? STRAINING'DEVICE FOR V GUUM- DRYINGAPPARATUS" Augustinus Edvard Jonsson. stockholin s weden ApplicationJune 30, 1933, Serial No'. 678,392 j t 1 In SwedenAugust 31,193,}; 1

I The present invention relates to a straining Fig, a'fjs'ection alon'gline C-Cin Figjim Q device in such vacuum drying apparatus as are j Fig.(shows 'aplan view of'a straining'devi'ce provided with a rotating oroscillating drying 7 according tothe second above mentioned form drum,which by means of one or more strainers of the invention.

communicates with a vacuum source, the said Fig." 8 illustratesdiagrammatically 'thdmO-i 5 straining device being combined with acleansing tions of'fthe cleansing .device. according to.v Figs. device,which during the rotary motions of the Sand 7'du1ing the rotationof..thejdrying drum. drying drum by the action of gravity isdis- In theillustrated 'formsof fthefinvention, the placed in relation to thestraining. device. Dur-' strainer ,isshown as a p'l'ane strainerJinFigsl l0 ing this relative movement cleansing means and '2as'asquareplatewith straight straining (such as projections, teeth,needles or the like) slots, in Figs. 3,4, 6 'and'la's a circulardisc procleanse the strainer openings. 'f 'vided with a great number'o'fholeswhich; as straining devices of the above mentioned kindillustrated, jinay suitably be arrangedi in" rows.- are described in theU. S. Patent No."1,748,955, The straining deviceisattached to a "gablewall which discloses a cylindrical strainerprovided 0f thedrying and'thus participatesin the fwith peripheral straining slots, into whi chexrotating m fi fla f the lat rlt gi-b are tend cleansing teeth arrangedon an eccentricalranged; on ,thejoutsideoi a gable llwalloof the lyloaded holder pivotally 'journalled around, the dryin drumahditmay bee cd i -a special strainer and so arranged that'during the rotary chamberthatcommunicates-jwith, the source oi motion of the drying drum thecleansing teeth vacuum... e "1 are displaced in said slots by'reason ofthe fact In-Figs. 1 and); theysfirainer 1 i PlQYi QQ-W h that gravitytends to maintain saidholder in a. eat um f Of P ralle ra hi fi fla in qa stable state of equilibrium. .Olwingf to the slots 2. .Intdfltheseextend projections or-teeth character of the-construction; the cleansingmo- 3 arranged on -a d w h Constitutes a tion will proceed comparativelyslowly as it takes W i i p l il e l h m 25 place during a comparativelyreat r't f beroftethB corresponds to the number of slots wholerevolution oi the drying drum. Further, 2 Th holde weig .ejis lidin lyarranged no reversal of the direction-of the cleansing will alo a s eisba ,5* e withsvthe a n.- take place, untiith direction of rotation ofthe. i s l t -'1 e e 'rests e ain tthe bosses 7 3 drying drum isreversed. I on-thefstrainer'and is attached by.meansof the In a.straining device according totheiprsent b lts 6. T th bos es" h e; tte hr si entinvention a much"quicker and more powerful Stops-3, WhiQh mlifli 1 05 Q 't e i h cleansing action takes place and it is carried 4 oi e be te 'id a p thei e out during asmall fraction or a; revolution ofpart o theetreiner provided-withithe.straining the drying drum.Furthermore, the direction of slots 2 pro ts so w a o the s o d g 35 the'cleansing action during one revolution will lanse p'er the trai erse ht cleansing be reversei'so thatthe cleansing members, ant; teet awithout bstr etionem e d la mg each complete ,revolution, will execute aalong h- 5 1 Q 3$l9 n ew t cleansing motion back and roan across the orou d i the in orde to-p ve m 40 strainer. l purities...accumulatinginthe slots from being The two above mentioned forms of a strainingpackd' togeth r atth.;6nd Pf- S- device according to the invention areby way of r d q fiiml. OWP in ig 3. and-4 difexample illustrated on theaccom'pa yingidraw fersflfron theiioregoing form substantially with Iregardf totheshape.ofthe straining openings f,

Fig. 1 is a section along line A A in Fig. 2. ,Qt 36..lZQQ-GQS ISQ-mBmbBIS.., e S fdn ll op -.1 45 i Fig. 2 shows aplan View of astraining device" 111957518 HQI 1 e m f O -r according to the firstmentioned form off/he long hdldeis 9 fidina p a 11 tha i invention. t II tached to the frame 10 of the strainer. The

i Fig. sis asection along line 13-113 in Fig. 4. plate is shown, s be grular, but may-a o, Fig. 4 shows a plan view of a modification of a 1 1 1Thgholgs? a e su ta l 50 the straining device'irom' that shown ,in Figs.re d np r s-tme e ng me b s. I and 2. a g consistjofflresilientneedlesl1 attached ina fash- 1 Fig. 5 illustrates diagrammatically the mion'similar'to aibrush on the bottom side of the tions-of the cleansingdevice accordingto Figs. slidablef'we'ight .4... WhenItheweight .14slides 1-4 during the rotation of the dryingd'rum along the bar 5', thepoints of the needle's'l'l will 55 13 is the circular coursealongwhich'thecentreof the strainer 1 moves during the rotation ot thedrum. The strainer 1 and the bar ,5, are so arranged that theirparallelcentral lines will be tangents of said circular.=-c ourse -l3:'At the position of departure I in Fig. 5, theweight 4 is supposed tooccupy the position furthest to the rectipns.

right and to be in contact with the corresponding stops. The bar 5- is,now, horizontal,- but on the ro a i n o he drumin. the ire i n: of thear ow, the bar ,willlbeein' tiojoccupy an inclined position towardsthehorizontal plane. In a ert n s tion II, the inclination. has become sogreat thatftheactionfof gravity'along the bar'is equlal to the iiijjitipn.,.v The weight. 4 has ne bee ifhrs eh to a; s a t posi io r afalling motion. Qn the continued rotation of th rum eaidie ine.motion'isi quickly car ied i teed he wei ht sli e erer e the-ether $5.du ing 'which rnotion the teeth or needles eifectathoroughcleansingotthe strainer; In the osi ie- I I. t e bar 5. is ver n the ins m ien hasb e ii emple ed In; the; position lfy diametrically opposite topositionII, theinclination of, the'bar 5,. is again t e a-new ell n whenm b i The weight will; then move ina reversedidirection in relation tothe strainer. In position V the'bar ain. YQ TUQ LPHF h e h is-nowflgain3 h ewerend f hfle a d" a, e fal motion been completed. The j strainer;is

thereupon carried'backftothe position of de-r.

parture iwithout-iurther motion of the cleansinfg membersj Thus, theweight has. duringja revolution of the'drumcompleted a motion back id."th. e em h ba and s q y cleansed thestrainer twice, and, infopposite diweight: will; occur-' in 'the same way According to the formillustrated-in Figs, Sand '7; the holder carryingthecleansing members isv in the form-'of-a weight loaded arm" 14; PiVCtally journalledon agable wall ofthejdrying drum about the pin 15. TheQstrainer-andithecleans m L em e e i lth e eeeh w a r i a ie t iesimi aim; ndie: T 'epivot pin 15" should, ,be arranged between the centre off'the strajnei'g2 and-the axis of rotation of the drum. The-free-end of the arm-I4shouldsuitably; constitute awei'ght ofa com aratively.

large mass. Onthe 'side of-the-weightw;turned? towards the strainer,"the cleansing embers; areattacheda" Twostops' 17'and liiare.attached? onthe gablefwall; oPthe drum in; order. to limit? themotionsofthe-armlh'Said motions during arevolution of theid'rum are diagrammaticallyillustrated inl.Fig. 8. 19.

' islthe agisof, rotationgofthe drum, and 20'isthe circular uss; along'which the centre of fth'e,

strainer 21 YniQYFSI duringthe rotation of the drum.-v y he. nsitionfl'oind parture.la h m.

a imated; o esta aihst Tone or, the s ep b Onth e rs o e ien o ;,m tion;of the drum, the, falling motions'of thep 17. On the rotation of thedrum in the direction of the arrow, the arm 14 will at first more andmore approach a vertical position. In position II this is supposed tohave happened. The arm 14 now occupies a position of unstableequilibrium. After some further motion of the drum, the arm will falldown on account of the action .of. gravity, and the cleansing .isquickly carried out. The arm lw'ill thereupon at first rest against theother stop 18, as indicated by dot and dash lines at position II. On thecontinued rotation of the drum the arm 14 will .again'approach a newvertical position, which Chas-been reached in position III. Theweightloaded end now'hangsdownwards, and the arm has left the contactwith the stop 18 and has now occupied a position of stable equilibrium,in

which gravity strives to maintain it.

During the next following period a relative motion will thereforoccurbetween the arm 14 and the strainerin an opposite direction to themotionjust described, although slower. During this-relative motion, thestrainer is cleansed once more but in the opposite direction. Inposition IV, diametrically opposite to position I, the arm 14 hangsvertically downwards along the central line of the: strainer. InpositionV, the arm '14 has passed; over the strainer and finished the secondcleansing operation. It is realized that during the continued rotationof the drum contactwill finally occur between the stop 17and the arm 14,which happens in position VI, whereway that during the rotary motion ofthe dryingdrum it is. periodically brought into starting positions for afree falling motion, during which motion the cleansing action isquickly'accomplished. According to one form of the invention, thesaidweight is guided alonga straight line by means of one or morestraight bars so ar ranged. that they, during the rotary motion ofthedrying drum, will occupy inclined positions towards thehorizontalplane, thereby causing the fallingmotion of the said weight. Accordingto anotherform of the invention, said weight is arranged. on a pivotingarm, which is so journalled and so guided by stops arranged onthe dryingdrum that. theweight during the rotary motion ofthe drum 'will bebrought into a state of unstable equilibrium, from which, during thecontinued rotation-of the drum, it will carry out a quick.. ,falling,motion with accompanyingcleansingioperation.

f The invention is not limited to the illustrated: for'ms. Thestraining. and cleansing device may ,be modifie'dlin. difierent wayswithout departing from the spirit of the invention.

Having now particularly described the-nature of my invention and themanner of its operation what I claimnisz .1. A device of the characterdescribed, comprising in combination," a rotatable support, a

straining device mounted to take part in the rotary motion of saidsupport, the surface of said straining-device being provided withStrain.

ing openings, a weight-loaded cleansing device provided with cleansingmembers adapted to enter said straining openings, means for guiding saidweight-loaded cleansing device during the rotation of said support so asto bring it to a starting position for a falling motion, during whichthe cleansing operation takes place by displacement of the cleansingmembers in the straining openings.

2. A device of the character described, comprising in combination, arotatable support, a straining device mounted to take part in the rotarymotion of said support, the surface of said straining device beingprovided with straining openings, a weight-loaded cleansing deviceprovided with cleansing members adapted to enter said strainingopenings, means for guiding said weight-loaded cleansing device duringthe rotation of said support so as to bring it to a starting positionfor a falling motion, during which the cleansing operation takes placeby displacement of the cleansing members in the straining openings, saidweight-loaded cleansing device having means for guiding it in a straightline along the surface of the strainer.

3. A device of the character described, comprising in combination, arotatable support, a straining device mounted to take part in the rotarymotion of said support, the surface of said straining devicebeing'provided with straining openings, a weight-loaded cleansing deviceprovided with cleansing members adapted to enter said strainingopenings, means for guiding said weightloaded cleansing device duringthe rotation of said support so as to bring it to a starting positionfor a falling motion, during which the cleansing operation takes placeby displacement of the cleansing members in the straining openings,saidvveightloaded cleansing devicecomprising a pivot arm so adapted thatsaid guiding means during the rotation of the support will bring it intoan unstable position of equilibrium, which will be the starting point ofsaid falling motion.

4. A device according to claim 3, and wherein the pivot of said'pivotarm is arranged between the centre of the strainer and the axis ofrotation of said support.

5. A device according to claim 1, and wherein said support to limit theswinging motions of said pivot arm.

10. Adevice of the character described, comprising in combination, arotatable support, a straining device mounted to take part in the rotarymotion of said support, the surface of said straining device, beingprovided with straining openings, a weight-loaded cleansing deviceprovided with cleansing members adapted to enter said strainingopenings, means for guiding said weight-loaded said guiding meansconsist of stops attached to v cleansing device during the rotation ofsaid support so as to bring it to a'starting position for a fallingmotion, during which the cleansing operation takes place bydisplacement, of the cleansing members in thestraining openings, saidweightloaded cleansing device being arranged as a pivot arm so adaptedthat said guiding means during the rotation of the support will bring itinto an unstable position of equilibrium, which will be the startingpoint of said falling motion, said guiding means consisting of stopsattached to said support to limit the swinging motions of said pivot armand so arranged that the weight-loaded pivot arm willduring the rotationof said support be directed outwards from the axis of said support.

11. A device according to claim 1 and wherein the straining openingsconsist of straightslots with open ends.

AUGUSTINUS EDVARD JONSSON.

